UNIT: CONCRETE/MASONARY Concrete Proportions MIXTURE OF INGREDIENTS CEMENT PASTE – This is the mixture of cement and water that determines the concrete’s strength; it varies according to water-cement ratio. Water-Cement Ratio
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
a. These are usually 5, 6, or 7 gallons of water to 1 sack of cement; the most common ratio is 6:1
b. This amount of water takes into account the water in the sand.
2. Cementcomes in 94 pound sacks containing 1 cubic ft.
This moisture needs to be estimated and an allowance made for it.
The more moisture there is in the sand, the less water needs to be added when mixing.
Damp Sand falls apart when squeezed into a ball. It contains about ¼ gallon of water per cubic foot.
Ratio is expressed as a three digit number called a mix, for example, 1:2:3.
cement paste dries and gardens.
3. The intended use of the concrete
also determines the ratio of the
Common slumps used for most jobs are 3-4 inches. Slump should never exceed 6”.
The slump is determined by a test using a conical cylinder and a portion of the concrete batch to pour. The cylinder has a 4” diameter opening at the top and an 8” diameter opening at the bottom, and is 12” high.